On Lattice Distortion By Isovalent Cations In Silver Sulphate Solid Electrolyte
S. W. Anwane
Volume 3, Issue 3, Page 204-212 | DOI: 10.5185/amlett.2012.4332
Keywords: Lattice distortion; solid electrolytes; silver sulphate; fast ionic conductors.
Detailed impedance spectroscopic studies are carried out by incorporating various guest iso-valent cations within the solid solubility limit having different ionic radii in Ag2SO4. The solid solubility limits up to x = 3 mole% cation doped Ag2SO4 are set with XRD, SEM, IR and DSC techniques. A major dependence of conductivity on the ionic size of the doped iso-valent cations is observed. The ionic conductivity is found to increase with the incorporation of a guest cation that creates appropriate distortion factor in iso-valent cation doped Ag2SO4. The conductivity of Ag2SO4 is found to be dependent on the ionic size of the guest cation, particularly in the low-temperature modification of Ag2SO4 (β-phase). These results could throw light on the fundamental conduction mechanism in Ag2SO4 and also on the criterion of selecting the impurity cation in the classical doping method. The optimized solid electrolytes can then be utilized for their technological applications in electrochemical devices such as SOx sensors and thermal batteries. Copyright © 2012 VBRI Press.